fix: Consider the Purchased Products Only

The billing SDK's queryPurchases returns a list of purchases that
are currently in a purchased, pending, or unspecified state. For
the unfulfilled purchase flow, we only need to consider the
'purchased' state.

Fixes: LEARNER-9878

OpenEdXMobile/src/main/java/org/edx/mobile/inapppurchases/BillingProcessor.kt

@@ -15,6 +15,7 @@ import com.android.billingclient.api.ConsumeParams
 import com.android.billingclient.api.ProductDetails
 import com.android.billingclient.api.ProductDetailsResult
 import com.android.billingclient.api.Purchase
+import com.android.billingclient.api.Purchase.PurchaseState
 import com.android.billingclient.api.PurchasesUpdatedListener
 import com.android.billingclient.api.QueryProductDetailsParams
 import com.android.billingclient.api.QueryPurchasesParams
@@ -242,7 +243,7 @@ class BillingProcessor @Inject constructor(
             QueryPurchasesParams.newBuilder()
                 .setProductType(BillingClient.ProductType.INAPP)
                 .build()
-        ).purchasesList
+        ).purchasesList.filter { it.purchaseState == PurchaseState.PURCHASED }
     }
 
     suspend fun consumePurchase(purchaseToken: String): BillingResult {